CN2922235Y - Power lithium ion cell protecting circuit - Google Patents

Power lithium ion cell protecting circuit Download PDF

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Publication number
CN2922235Y
CN2922235Y CN 200620085240 CN200620085240U CN2922235Y CN 2922235 Y CN2922235 Y CN 2922235Y CN 200620085240 CN200620085240 CN 200620085240 CN 200620085240 U CN200620085240 U CN 200620085240U CN 2922235 Y CN2922235 Y CN 2922235Y
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CN
China
Prior art keywords
circuit
voltage
charging
control switch
battery
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Expired - Fee Related
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CN 200620085240
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Chinese (zh)
Inventor
刘振华
徐建华
王建武
高玉光
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GUANGHUA BATTERY CO Ltd WEIFANG
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GUANGHUA BATTERY CO Ltd WEIFANG
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Priority to CN 200620085240 priority Critical patent/CN2922235Y/en
Application granted granted Critical
Publication of CN2922235Y publication Critical patent/CN2922235Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a power lithium ion cell protecting circuit, the main technical outline of which is that comprising an over-charging protecting circuit for over-charging protection of a cell group constituting a plurality of series lithium ion charging cells, an over-discharging protecting circuit for over-discharging protection of the cell group, an over-current protecting circuit for over-current protection of the cell group and a balance charging circuit for equal charging of each cell monocase of the cell group. The utility model resolves not only problem of whole group cell damage because of over-charging and over-discharging of the cell and performance difference in each cell monocase of the cell group, but also the charging voltage of each cell monocase is basically consistent after charging by the balance charging circuit, thereby improving the charge preservation capability of whole group of cell and enhancing the overall performance of the cell group, which is particularly suitable for the power cell of more than four nodes of series lithium ion cells.

Description

The protective circuit of power lithium-ion battery
Technical field
The utility model relates to the protective circuit of Li-Ion rechargeable battery, relates in particular to the protective circuit that a kind of and rechargeable battery are combined use.
Background technology
Lithium ion battery does not have memory effect, so be desirable rechargeable battery.When it uses as electrokinetic cell, when for example using, often need 7~13 joint lithium ion battery series connection are used, to reach the needed voltage of motor with its driving battery as electric bicycle.When the multiple batteries series connection is used, when especially the above battery series connection of 4 joints is used, because the performance index of every batteries can not be just the same, its step when charging, discharge just can not be in full accord, in case have a batteries to be in overcharge condition, just may cause lithium ion excessively to take off embedding, thereby make short circuit between electrodes from positive pole, not only influence battery capacity, life-span, and cause battery explosion, extreme phenomenon such as on fire easily; In case there is a batteries to be in over-discharge state, just may cause lithium ion excessively to take off embedding, thereby make short circuit between electrodes from negative pole, influence battery capacity, life-span; Because the difference of the capacity between each battery cell, self discharge etc. is accumulated over a long period, in use for some time, the retention of charge of battery pack obviously reduces, and has influenced lithium ion battery applying in a wider context.In addition, in the charging process or in the discharge process, the situation of overcurrent or short circuit might appear all, if the untimely prevention of this situation, life-span of serious harm battery not only, and cause easily electrical appliance damage, cause phenomenons such as on fire, explosion.Therefore, when the multiple batteries series connection was used, the quality of its performance not only depended on the quality of battery cell quality, the prior height that depends on its total quality.Regrettably, in known technology, do not find the protective circuit of the battery pack use of forming at the above lithium ion battery of four joints.
Summary of the invention
Technical problem to be solved in the utility model is: the protective circuit that a kind of power lithium-ion battery is provided; to solve when the series connection of multi-section lithium ion battery is used; owing to have performance difference between each battery cell; easily overcharge or overdischarge the problem that causes whole Battery pack to damage because of single battery.
For solving the problems of the technologies described above, the technical solution of the utility model is: the protective circuit of power lithium-ion battery, comprise by a pair of input/output port and be connected in the main circuit that the battery unit between the described a pair of input/output port is formed that described battery unit is the battery pack that is in series by the multi-section lithium ion rechargeable battery; This protective circuit comprises an additives for overcharge protection circuit and an over circuit; Described additives for overcharge protection circuit comprises a charging control switch that is connected in the described main circuit, with overcharge voltage test section that the voltage and the setting voltage of battery can be compared and export comparative result and the logic control portion of overcharging that controls described charging control switch on/off according to the output signal of described overcharge voltage test section; Described over circuit comprises a discharge control switch that is connected in the described main circuit; with overdischarge voltage detection department that the voltage and the setting voltage of battery can be compared and export comparative result and the overdischarge logic control portion that controls described discharge control switch on/off according to the output signal of described overdischarge voltage detection department.
As a kind of embodiment, described overcharge voltage test section comprises the positive and negative end that is connected described each batteries, the charging deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits of comparative result; The described logic control portion of overcharging comprises that overcharge the low level voltage that logical circuit exports of being equivalent to of the voltage signal of the overcharge logical circuit and the logical circuit output of can will be described overcharging that can carry out logical operation according to the input signal of described these differential circuits and a setting compares and export the voltage comparator of comparative result.
As another kind of embodiment, described overdischarge voltage detection department comprises the positive and negative end that is connected described each batteries, the discharge deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits of comparative result; Described overdischarge logic control portion comprises the overdischarge logical circuit that can carry out logical operation according to the input signal of described these differential circuits and the voltage that is equivalent to described a plurality of discharge deboost sums of the voltage signal of described overdischarge logical circuit output and a setting can be compared and exports the voltage comparator of comparative result.
As a kind of improvement, the positive and negative end of each batteries of described battery unit connects an equalization charging circuit respectively, and described equalization charging circuit comprises the voltage detection department and a self discharge branch road that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result; Described each self discharge branch road comprises an impedance component and the self discharge control switch that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section.
As further improvement, described protective circuit also comprises circuit overcurrent protection, described circuit overcurrent protection comprises and can control first delay circuit that described discharge control switch time-delay disconnects with the voltage at the two ends of described discharge control switch and the first overcurrent test section that setting voltage compared and exported comparative result with according to the output signal of the described first overcurrent test section; The described first overcurrent test section comprises the voltage comparator of a plurality of parallel connections; Described first delay circuit comprises clock oscillator and a plurality of counters that can count according to the clock of clock oscillator, and a plurality of voltage comparators of a plurality of counters of described first delay circuit and the described first overcurrent test section are corresponding one by one; Also comprise and to control second delay circuit that described charging control switch time-delay disconnects with the voltage at the two ends of described charging control switch and the second overcurrent test section that setting voltage compared and exported comparative result with according to the output signal of the described second overcurrent test section; The described second overcurrent test section comprises the voltage comparator of a plurality of parallel connections; Described second delay circuit comprises clock oscillator and a plurality of counters that can count according to the clock of clock oscillator, and a plurality of voltage comparators of a plurality of counters of described second delay circuit and the described second overcurrent test section are corresponding one by one.
As a kind of another kind of improvement, be in series with inductance element in the described main circuit.
After having adopted technique scheme, the beneficial effects of the utility model are: because this protective circuit comprises an additives for overcharge protection circuit and an over circuit, during charging, when the virtual voltage of each batteries all is lower than the charging deboost of setting, the differential circuit of logic control portion of overcharging provides the virtual voltage of single battery to the logical circuit that overcharges of the logic control portion of overcharging, these actual voltage signal are overcharged and are outputed to the voltage comparator of logic control portion that overcharges after the computing of the logical circuit that overcharges of logic control portion, at this moment, the voltage signal of input voltage comparator must be one and be higher than the low level voltage of logical circuit output that overcharges, so voltage comparator sends high level to charging control switch in the back with itself and the low level voltage ratio of setting that is lower than the logical circuit output of overcharging, the charging control switch conducting, battery pack charges normal; When the virtual voltage of any batteries is higher than the charging deboost of setting, corresponding differential circuit will send low level to the logical circuit that overcharges, the logical circuit that overcharges through computing and voltage comparator relatively after, then send low level to charging control switch, disconnect charging circuit, stop charging.During discharge, when the virtual voltage of each batteries all is higher than the discharge deboost of setting, the differential circuit of overdischarge voltage detection department provides the virtual voltage of single battery to the overdischarge logical circuit of overdischarge logic control portion, output to the voltage comparator of overdischarge logic control portion after the computing of these actual voltage signal through the overdischarge logical circuit of overdischarge logic control portion, compare with a voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting, if be higher than this voltage, then send high level to discharge control switch, the discharge control switch conducting, battery pack regular picture; If be lower than this voltage, then send low level to discharge control switch, discharge control switch disconnects, and stops discharge; When the virtual voltage of any batteries is lower than the discharge deboost of setting, corresponding differential circuit will send low level to the overdischarge logical circuit, the overdischarge logical circuit through computing and voltage comparator relatively after, also send low level to discharge control switch, disconnect discharge circuit, stop discharge.Therefore, when the series connection of multi-section lithium ion battery is used, any batteries can not be subjected to overcharging and the damage of overdischarge, and when the voltage of whole Battery pack is lower than the voltage of a setting, discharge circuit also can automatic disconnection, because this setting voltage is lower than the discharge deboost sum of all single batteries of battery pack, so it can be when every batteries all reach the discharge deboost of setting, discharge circuit is disconnected, avoid battery pack under a nonsensical low-voltage, to work on, thereby make the use of battery pack safer and economical.
Because the positive and negative end of each batteries of described battery unit connects an equalization charging circuit respectively, so, in charging process, when if the virtual voltage of a certain batteries is higher than the rated voltage of single battery of setting, its corresponding voltage detection department will send high level, the self discharge control switch is communicated with, makes this batteries in charging, carry out self discharging, thereby reduced the charging current of this batteries by the self discharge branch road; After charging finished, all batteries that are higher than the rated voltage of setting also can continue self discharging by corresponding self discharge branch road, until the rated voltage of reducing to setting, at this moment, voltage detection department will send low level, and the self discharge control switch disconnects the self discharge branch road, and self discharging stops.By self discharging, the voltage of each battery cell of charging back battery pack is consistent substantially, has eliminated because of the influence of the performance difference between each battery cell to the retention of charge of battery unit, has promoted the overall performance of battery pack.
Because described protective circuit also comprises circuit overcurrent protection, described circuit overcurrent protection comprises discharge over-current protective circuit and charge over-current protective circuit, so, when regular picture, flow through normal operating current in the main circuit, the voltage at the two ends of discharge control switch is lower than setting voltage, first current detecting part output high level, discharge control switch is in logical state, battery pack regular picture; When overcurrent or short-circuit conditions occurring; big electric current can appear in the main circuit; thereby the voltage that makes the discharge control switch two ends raises rapidly and exceeds setting voltage; at this moment; the first current detecting part output low level; the counter of first delay circuit is counted according to the clock of clock oscillator; when after the counting of counter finishes, still receiving the low level signal of exporting from first current detecting part; this delay circuit is output low level; discharge control switch is disconnected; cut off main circuit, thereby make whole battery group in discharge process, obtain overcurrent protection.The benefit of delay circuit is can not occur misoperation because of the current fluctuation of short time.Because the described first overcurrent test section comprises the voltage comparator of a plurality of parallel connections; Described first delay circuit comprises clock oscillator and a plurality of counters that can count according to the clock of clock oscillator, a plurality of voltage comparators of a plurality of counters of described first delay circuit and the described first overcurrent test section are corresponding one by one, these voltage comparators can be provided with different reference voltages, so, signal according to different voltage comparator output can be distinguished different excess currents, adopts different time of delay.Overcurrent is big more, and time of delay is short more, thereby can protect discharge control switch not to be damaged.According to same reason, the charge over-current protective circuit can make whole battery group obtain overcurrent protection in charging process, and can not occur misoperation because of the current fluctuation of short time.
Owing to be in series with inductance element in the described main circuit; when the battery pack operate as normal; inductance element is inoperative; but; when the electric current in the main circuit became big or load short circuits suddenly, inductance element can produce induction reactance, and the detected magnitude of voltage of the first or second overcurrent test section is raise rapidly; discharge control switch or charging control switch can disconnect in the shorter time, thereby discharge control switch or charging control switch are played the better protection effect.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the circuit theory diagrams of additives for overcharge protection circuit part among the utility model embodiment;
Fig. 2 is the circuit theory diagrams of over circuit part among the utility model embodiment;
Fig. 3 is the circuit theory diagrams of equalization charging circuit part among the utility model embodiment;
Fig. 4 is the circuit theory diagrams of circuit overcurrent protection part among the utility model embodiment.
Embodiment
Fig. 1 shows the circuit theory diagrams of additives for overcharge protection circuit 1 among the utility model embodiment, for the purpose of simplifying the description, the other parts of protective circuit has been omitted.
In the present embodiment, positive terminal 102 and negative terminal 103 are as output port, and during charging, it is connected with negative pole with the positive pole of charger respectively, and during discharge, it is connected with load respectively.Battery unit 101 is the battery pack that are in series by the multi-section lithium ion rechargeable battery, can be four joints, also can be the above any more pieces of four joints.Positive terminal 102, negative terminal 103 and be connected the main circuit that battery unit 101 between positive terminal 102, the negative terminal 103 has constituted protective circuit.
In the additives for overcharge protection circuit 1 of present embodiment, charging control switch 104 is made of the MOSFET pipe, and charging control switch 104 is connected between the negative pole and negative terminal 103 of battery unit 101.Be connected with a plurality of differential circuits 11 that the discharge deboost of this batteries of the virtual voltage of every batteries and setting can be compared and exports respectively comparative result at the positive and negative end of each batteries of described battery unit 101, differential circuit 11 is corresponding one by one with the battery cell of described battery unit.The comparative result of all these differential circuits 11 is imported the logical circuit 12 that overcharges respectively, the output of logical circuit 12 of overcharging connects a voltage comparator 13, voltage comparator 13 can compare the low level voltage that logical circuit exports that overcharges of being equivalent to of the voltage signal of logical circuit 12 output of overcharging and a setting, and this voltage can artificially be regulated.The output of voltage comparator 13 is connected with the grid of the MOSFET pipe that uses as charging control switch 104.All these differential circuits 11 have constituted the overcharge voltage test section of additives for overcharge protection circuit 2, and overcharge logical circuit 12 and voltage comparator 13 have constituted the logic control part of overcharging of additives for overcharge protection circuit 2.
Fig. 2 shows the circuit theory diagrams of over circuit 2 among the utility model embodiment, for the purpose of simplifying the description, the other parts of protective circuit has been omitted.
In the over circuit 2 of present embodiment, discharge control switch 105 is made of the MOSFET pipe, and discharge control switch 105 is serially connected in the described main circuit.Be connected with a plurality of differential circuits 21 that the discharge deboost of this batteries of the virtual voltage of every batteries and setting can be compared and exports respectively comparative result at the positive and negative end of each batteries of described battery unit 101, each differential circuit 21 is corresponding one by one with each battery cell of described battery unit 101.The comparative result of all these differential circuits 21 is imported overdischarge logical circuit 22 respectively, the output of overdischarge logical circuit 22 connects a voltage comparator 23, voltage comparator 23 can compare voltage signal and voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting of overdischarge logical circuit 22 outputs, and this voltage can artificially be regulated.The output of voltage comparator 23 is connected with the grid of the MOSFET pipe that uses as discharge control switch 105.All these differential circuits 21 have constituted the overdischarge current detection section of over circuit 2, and overdischarge logical circuit 22 and voltage comparator 23 have constituted the overdischarge logic control part of over circuit 2.
Fig. 3 shows the circuit theory diagrams of equalization charging circuit 3 among the utility model embodiment, for the purpose of simplifying the description, the other parts of protective circuit has been omitted.
In the equalization charging circuit 3 of present embodiment, the positive and negative end of each batteries of described battery unit 101 connects a voltage detection department 31 that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result, and described voltage detection department 31 is made of differential circuit.The positive and negative end of described each batteries also connects a self discharge branch road, described each self discharge branch road comprises an impedance component 33 and the self discharge control switch 32 that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section 31, described self discharge control switch 32 is made of the MOSFET pipe, and the output of described voltage detection department 31 is connected with the grid of MOSFET pipe.Self discharge control switch 32 also can adopt other electric-controlled switch elements such as triode, as long as it can just can be in connected sum disconnection two states respectively according to a high level and a low level.
Fig. 4 shows the schematic diagram of circuit overcurrent protection 4 among the utility model embodiment, for the purpose of simplifying the description, the other parts of protective circuit has been omitted.
In the circuit overcurrent protection 4 of present embodiment, between the corresponding source electrode of discharge control switch 105 and charging control switch 104 and drain electrode, be in series with two inductance elements 106 and 106 '.
Circuit overcurrent protection 4 comprises charge over-current protective circuit and discharge over-current protective circuit.
Described discharge over-current protective circuit comprises and can and control first delay circuit 46 of described discharge control switch 105 time-delay disconnections according to the output signal of the described first overcurrent test section with the voltage at the source electrode of described discharge control switch 105 and drain electrode two ends and the first overcurrent test section that setting voltage compared and exported comparative result.
The described first overcurrent test section comprises two voltage comparators 41 and 42, described these two voltage comparators 41 and 42 first input end all are connected between two inductance elements 106 and 106 ' in the described main circuit by a shunt resistance 45, described these two voltage comparators 41 are connected with 44 with constant voltage source 43 respectively with 42 second input, described these constant voltage sources 43 and 44 can the people be set two voltages inequality for, are respectively applied for less overcurrent and big overcurrent when detecting discharge.
Described first delay circuit 46 comprises clock oscillator and two counters can counting according to the clock of clock oscillator, and two counters of described first delay circuit 46 are corresponding one by one with two voltage comparators of the described first overcurrent test section.The output of described first delay circuit 46 is connected with the grid of discharge control switch 105.The counter of the voltage comparator of the first overcurrent test section and first delay circuit is not limited to two, also can be a plurality of, and its purpose is, adjusts the length of delay time better according to the size of excess current.
Described charge over-current protective circuit comprises and can and control second delay circuit 46 ' of described charging control switch 104 time-delay disconnections according to the output signal of the described second overcurrent test section with the voltage at the source electrode of described charging control switch 104 and drain electrode two ends and the second overcurrent test section that setting voltage compared and exported comparative result.
The described second overcurrent test section comprises two voltage comparators 41 ' and 42 ', described these two voltage comparators 41 ' and 42 ' first input end all are connected between two inductance elements 106 and 106 ' in the described main circuit by a shunt resistance 45 ', described these two voltage comparators 41 ' are connected with 44 ' with constant voltage source 43 ' respectively with 42 ' second input, described these constant voltage sources 43 ' and 44 ' can the people be set two voltages inequality for, are respectively applied for less overcurrent and big overcurrent when detecting charging.
Described second delay circuit 46 ' comprises clock oscillator and two counters can counting according to the clock of clock oscillator, two counters of described second delay circuit 46 ' are corresponding one by one with two voltage comparators of the described second overcurrent test section, and the output of described second delay circuit 46 ' is connected with the grid of charging control switch 104.The counter of the voltage comparator of the second overcurrent test section and second delay circuit is not limited to two, also can be a plurality of, and its purpose also is in order better to adjust the length of delay time according to the size of excess current.
Because additives for overcharge protection circuit 1 and charge over-current protective circuit all are to control the through and off of main circuit by charging control switch 104; so after its both output signal should at first be carried out logical operation by an AND circuit, output to the grid of charging control switch 104 again.Equally, after the output signal of over circuit 2 and discharge over-current protective circuit also should at first be carried out logical operation by an AND circuit, output to the grid of discharge control switch 105 again.
In sum, the protective circuit of power lithium-ion battery disclosed in the utility model is made up of additives for overcharge protection circuit 1, over circuit 2, equalization charging circuit 3 and circuit overcurrent protection 4, and they are integrated in the wiring board together.In charging process, when the charging voltage of any batteries surpasses the charging deboost of setting, main circuit is disconnected; In discharge process, when the discharge voltage of any batteries surpasses the discharge deboost of setting, main circuit is disconnected; Thereby make the battery pack can be, and cause whole Battery pack to damage because of not the overcharging or overdischarge of single battery.In addition, when overcurrent or short circuit occurring, main circuit is disconnected, thereby provide multiple protective battery pack.Simultaneously, it can be to each battery cell equalizing charge of battery pack, and each battery cell charging voltage after the charging is consistent substantially, has improved the retention of charge of whole Battery pack, has promoted the overall performance of battery pack.Be particularly suitable for using by the electrokinetic cell that the above lithium ion battery of four joints is in series.

Claims (10)

1, the protective circuit of power lithium-ion battery, comprise by a pair of input/output port and be connected in the main circuit that the battery unit (101) between the described a pair of input/output port is formed that described battery unit (101) is the battery pack that is in series by the multi-section lithium ion rechargeable battery; It is characterized in that: this protective circuit comprises an additives for overcharge protection circuit (1) and an over circuit (2); Described additives for overcharge protection circuit (1) comprises a charging control switch (104) that is connected in the described main circuit, with overcharge voltage test section that the voltage and the setting voltage of battery can be compared and export comparative result and the logic control portion of overcharging that controls described charging control switch (104) on/off according to the output signal of described overcharge voltage test section; Described over circuit (2) comprises a discharge control switch (105) that is connected in the described main circuit; with overdischarge voltage detection department that the voltage and the setting voltage of battery can be compared and export comparative result and the overdischarge logic control portion that controls described discharge control switch (105) on/off according to the output signal of described overdischarge voltage detection department.
2, the protective circuit of power lithium-ion battery as claimed in claim 1 is characterized in that: described overcharge voltage test section comprises the positive and negative end that is connected described each batteries, the charging deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits (11) of comparative result; The described logic control portion of overcharging comprises the logical circuit that overcharges (12) that can carry out logical operation according to the input signal of described these differential circuits (11) and overcharge the low level voltage that logical circuit (12) exports of being equivalent to of the voltage signal of the described logical circuit that overcharges (12) output and a setting can be compared and export the voltage comparator (13) of comparative result.
3, the protective circuit of power lithium-ion battery as claimed in claim 2 is characterized in that: described overdischarge voltage detection department comprises the positive and negative end that is connected described each batteries, the discharge deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits (21) of comparative result; Described overdischarge logic control portion comprises the overdischarge logical circuit (22) that can carry out logical operation according to the input signal of described these differential circuits (21) and the voltage that is equivalent to described a plurality of discharge deboost sums of the voltage signal of described overdischarge logical circuit (22) output and a setting can be compared and exports the voltage comparator (23) of comparative result.
4, as the protective circuit of described any power lithium-ion battery of claim 1 to 3, it is characterized in that: the positive and negative end of each batteries of described battery unit (101) connects an equalization charging circuit (3) respectively.
5, the protective circuit of power lithium-ion battery as claimed in claim 4 is characterized in that: described equalization charging circuit (3) comprises the voltage detection department (31) and a self discharge branch road that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result; Described each self discharge branch road comprises an impedance component (33) and the self discharge control switch (32) that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section (31).
6, the protective circuit of power lithium-ion battery as claimed in claim 5; it is characterized in that: described protective circuit also comprises circuit overcurrent protection (4), and described circuit overcurrent protection (4) comprises discharge over-current protective circuit and charge over-current protective circuit.
7, the protective circuit of power lithium-ion battery as claimed in claim 6, it is characterized in that: described discharge over-current protective circuit comprises and can control first delay circuit (46) that described discharge control switch (105) time-delay disconnects with the voltage at the two ends of described discharge control switch (105) and the first overcurrent test section that setting voltage compared and exported comparative result with according to the output signal of the described first overcurrent test section; The described first overcurrent test section comprises the voltage comparator of a plurality of parallel connections; Described first delay circuit (46) comprises clock oscillator and a plurality of counters that can count according to the clock of clock oscillator, and a plurality of voltage comparators of a plurality of counters of described first delay circuit (46) and the described first overcurrent test section are corresponding one by one.
8, the protective circuit of power lithium-ion battery as claimed in claim 7, it is characterized in that: described charge over-current protective circuit comprises and can control second delay circuit (46 ') that described charging control switch (104) time-delay disconnects with the voltage at the two ends of described charging control switch (104) and the second overcurrent test section that setting voltage compared and exported comparative result with according to the output signal of the described second overcurrent test section; The described second overcurrent test section comprises the voltage comparator of a plurality of parallel connections; Described second delay circuit (46 ') comprises clock oscillator and a plurality of counters that can count according to the clock of clock oscillator, and a plurality of voltage comparators of a plurality of counters of described second delay circuit (46 ') and the described second overcurrent test section are corresponding one by one.
9, the protective circuit of power lithium-ion battery as claimed in claim 8 is characterized in that: be in series with inductance element in the described main circuit.
10, the protective circuit of power lithium-ion battery as claimed in claim 1 is characterized in that: described charging control switch (104) and discharge control switch (105) are made of the MOSFET pipe respectively.
CN 200620085240 2006-06-08 2006-06-08 Power lithium ion cell protecting circuit Expired - Fee Related CN2922235Y (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102224678A (en) * 2008-11-27 2011-10-19 三美电机株式会社 Counter circuit and protection circuit
CN102299536A (en) * 2011-08-22 2011-12-28 青岛海霸能源集团有限公司 Anti-explosion and intrinsic safe lithium ion storage battery power supply management system for mine
CN102301562A (en) * 2009-02-02 2011-12-28 N奈维解决方案株式会社 Portable auxiliary power-source device for a vehicle
CN101394080B (en) * 2007-09-21 2012-12-19 深圳市比克电池有限公司 Battery pack protection circuit
CN104283241A (en) * 2013-07-05 2015-01-14 上海中聚佳华电池科技有限公司 Battery charging and discharging device and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394080B (en) * 2007-09-21 2012-12-19 深圳市比克电池有限公司 Battery pack protection circuit
CN102224678A (en) * 2008-11-27 2011-10-19 三美电机株式会社 Counter circuit and protection circuit
CN102224678B (en) * 2008-11-27 2014-07-16 三美电机株式会社 Counter circuit and protection circuit
CN102301562A (en) * 2009-02-02 2011-12-28 N奈维解决方案株式会社 Portable auxiliary power-source device for a vehicle
CN102301562B (en) * 2009-02-02 2015-03-25 N奈维解决方案株式会社 Portable auxiliary power-source device for a vehicle
CN102299536A (en) * 2011-08-22 2011-12-28 青岛海霸能源集团有限公司 Anti-explosion and intrinsic safe lithium ion storage battery power supply management system for mine
CN104283241A (en) * 2013-07-05 2015-01-14 上海中聚佳华电池科技有限公司 Battery charging and discharging device and method

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